{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{4}{c}}
\toprule
            &\multicolumn{1}{c}{\shortstack{Cand. wins,\\t+1}}&\multicolumn{1}{c}{\shortstack{Cand. vote\\share, t+1}}&\multicolumn{1}{c}{\shortstack{Cand. qualif.,\\t+1}}&\multicolumn{1}{c}{\shortstack{Orient. nb. other \\cand.,t+1}}\\\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}\cmidrule(lr){5-5}
            &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         \\
\midrule
Upper bound &       0.078\sym{***}&       0.067\sym{***}&       0.238\sym{***}&       0.181         \\
            &     (0.019)         &     (0.010)         &     (0.047)         &     (0.122)         \\
\addlinespace
Lower bound &       0.048\sym{***}&       0.023\sym{***}&       0.125\sym{***}&      -0.010         \\
            &     (0.016)         &     (0.007)         &     (0.043)         &     (0.114)         \\
\midrule
Bootstrap replications&          10         &          10         &          10         &          10         \\
Mean, left of threshold&       0.060         &       0.149         &       0.291         &       0.803         \\
\bottomrule
\end{tabular}
}
